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Test if a WebP with alpha was read correctly using subsampling.

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(cherry picked from commit 46b1c1cf960978788098b706f1ffdbfd86481ad0)
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tc-wleite 2023-03-15 11:43:51 -03:00 committed by Harald Kuhr
parent cb1dc3f4b5
commit 98104222cf
1 changed files with 23 additions and 0 deletions
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23
imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java
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@ -162,4 +162,27 @@ public class WebPImageReaderTest extends ImageReaderAbstractTest<WebPImageReader
reader.dispose();
}
}
@Test
public void testAlphaSubsampling() throws IOException {
WebPImageReader reader = createReader();
try (ImageInputStream stream = ImageIO.createImageInputStream(getClassLoaderResource("/webp/alpha_filter.webp"))) {
reader.setInput(stream);
// Read the image using a subsampling factor of 2
ImageReadParam param = new ImageReadParam();
param.setSourceSubsampling(2, 2, 0, 0);
BufferedImage image = reader.read(0, param);
assertRGBEquals("Expected transparent center (500, 362)", 0x00000000, image.getRGB(500, 362) & 0xFF000000, 8);
assertRGBEquals("Expected transparent at (240, 90)", 0x00000000, image.getRGB(240, 90) & 0xFF000000, 8);
assertRGBEquals("Expected opaque at (256, 640)", 0xFF000000, image.getRGB(256, 640) & 0xFF000000, 8);
assertRGBEquals("Expected opaque at (850, 120)", 0xFF000000, image.getRGB(256, 640) & 0xFF000000, 8);
}
finally {
reader.dispose();
}
}
}